PM Boris Johnson back to work as UK coronavirus problems mount

Beijing, Feb 18: A hospital director at the epicentre of China's virus epidemic died on Tuesday, state media said, the latest medical worker to fall victim to the new coronavirus spreading across the country.

The COVID-19 virus, which is believed to have originated in Wuhan late last year, has infected more than 72,000 people and killed nearly 1,900.

Liu Zhiming, the director of Wuchang Hospital in Wuhan, died Tuesday morning after "all-out rescue efforts failed," state broadcaster CCTV reported.

China said last week that six medical workers had died from the virus, while 1,716 have been infected.

Liu's death was initially reported by Chinese media and bloggers shortly after midnight on Tuesday -- but the stories were later deleted and replaced with reports that doctors were still trying to save him.

After initial reports of his death were denied, the hospital told AFP on Tuesday morning that doctors were giving him life-saving treatment.

Liu's death has echoes of that of Wuhan ophthalmologist Li Wenliang, who had been punished by authorities for sounding the alarm about the virus in late December.

Li's death prompted a national outpouring of grief as well as anger against the authorities, who were accused of mishandling the crisis.

People took to social media to mourn Liu on Tuesday, with many users on the Twitter-like Weibo platform drawing critical comparisons between Liu's death and Li's.

In both cases their deaths were initially reported in state media posts -- later deleted -- and their deaths denied, before being finally confirmed again.

"Has everyone forgotten what happened to Li Wenliang? They forcefully attempted resuscitation after he died," one Weibo commenter wrote.

Another commenter said, Liu "already died last night, (but) some people are addicted to torturing corpses".

A hashtag about Liu's death had 29 million views by Tuesday afternoon.

Doctors in Wuhan face shortages of masks and protective bodysuits, with some even wearing makeshift hazmat suits and continuing to work despite showing respiratory symptoms, health workers have told AFP.

Hubei province and its capital Wuhan have been the hardest hit by the virus, accounting for nearly 1,800 of the deaths from the virus so far.

London, May 20: The current physical distancing guidelines of 6 feet may be insufficient to prevent COVID-19 transmission, according to a study which says a mild cough in low wind speeds can propel saliva droplets by as much as 18 feet.

Researchers, including those from the University of Nicosia in Cyprus, said a good baseline for studying the airborne transmission of viruses, like the one behind the COVID-19 pandemic, is a deeper understanding of how particles travel through the air when people cough.

In the study, published in the journal Physics of Fluids, they said even with a slight breeze of about four kilometres per hour (kph), saliva travels 18 feet in 5 seconds.

"The droplet cloud will affect both adults and children of different heights," said study co-author Dimitris Drikakis from the University of Nicosia.

According to the scientists, shorter adults and children could be at higher risk if they are located within the trajectory of the saliva droplets.

They said saliva is a complex fluid, which travels suspended in a bulk of surrounding air released by a cough, adding that many factors affect how saliva droplets travel in the air.

These factors, the study noted, include the size and number of droplets, how they interact with one another and the surrounding air as they disperse and evaporate, how heat and mass are transferred, and the humidity and temperature of the surrounding air.

In the study, the scientists created a computer simulation to examine the state of every saliva droplet moving through the air in front of a coughing person.

The model considered the effects of humidity, dispersion force, interactions of molecules of saliva and air, and how the droplets change from liquid to vapour and evaporate, along with a grid representing the space in front of a coughing person.

Each grid, the scientists said, holds information about variables like pressure, fluid velocity, temperature, droplet mass, and droplet position.

The study analysed the fates of nearly 1,008 simulated saliva droplets, and solved as many as 3.7 million equations.

"The purpose of the mathematical modelling and simulation is to take into account all the real coupling or interaction mechanisms that may take place between the main bulk fluid flow and the saliva droplets, and between the saliva droplets themselves," explained Talib Dbouk, another co-author of the study.

However, the researchers added that further studies are needed to determine the effect of ground surface temperature on the behaviour of saliva in air.

They also believe that indoor environments, especially ones with air conditioning, may significantly affect the particle movement through air.

This work is important since it concerns safety distance guidelines, and advances the understanding of the transmission of airborne diseases, Drikakis said.

Washington, Jan 25: US President Donald Trump's legal team was preparing his defence on Saturday after the Democratic prosecutors ended their marathon 24-hour argument to oust him from office during the Senate trial.

In the arguments spread over three days ending on Friday, the Democrat prosecutors from the House of Representatives that had impeached Trump last month, mostly rehashed the testimonies from the hearings before their committees during the investigation and statements in their chamber.

Like the Democrats' arguments, the Trump defence's counter-arguments, also with 24 hours allotted for it, will be mind-numbing monologues for the most part and the real drama will be on a tussle between the two parties on calling witnesses.

The Democrats failed in their repeated attempts on the first day of the trial on January 28 to include calling testimonies from witnesses in the rules of procedure, but they will get another chance to press their case when the defence rests.

There is a tense wait speckled with speculations to see if the Democrats can get four Republicans to defect and vote to call witnesses after failing to sway a mass defection to get the two-thirds majority to convict Trump.

Trump is charged with abuse of power and obstruction of Congress in the trial presided over by Supreme Court Chief Justice John Roberts with the Senators acting as jurors.

As the time allotted for the prosecution wound down on Friday, the leading prosecutor, Adam Schiff, demanded that the Republican-controlled Senate convict and remove Trump from office, because he was an "imminent threat" to the US and the nation could not wait for the election to throw him out.

Schiff, who heads the House Intelligence Committee that investigated Trump, gave them a personal warning: "No matter how close you are to this president, do you think for a moment that if he felt it was in his interest, he wouldn't ask you to be investigated?

Jerry Nadler, the head of the Judicial Committee that framed the charges in the impeachment, called Trump a "dictator".

Instead of a full sitting of eight hours, the defence will present its case for only two to three hours on Saturday in what Trump's lawyer Jay Sekulow called a "trailer (for) coming attractions" in the defence counterarguments.

They will get to use their remaining time next week.

The shorter session starting with fuller presentations next week is partly a concession to media savvy Trump who tweeted that daytime Saturday when his defence was slated is a "death valley" on TV as few viewers would watch a political event at that time.

With Trump certain to be acquitted because the Democrats do not have the two-thirds vote, the impeachment process and the Senate trial are only meant to be an extended media show in their campaign for the November election.

The Democrats want to spiff up the TV spectacle by calling former National Security Adviser John Bolton and Trump's acting Chief of Staff Mick Mulvaney as witnesses.

Trump could exercise his executive privilege to stop them from testifying, in which case they could go to court to compel their appearance at the Senate trial extending its duration by months if not weeks.

The House charged him with obstruction of Congress because he refused to allow some of this staff to testify and release documents requested by the House investigators.

The Republicans, who want a quick end to the trial, can also counter the Democrats' request for witnesses by calling former Vice President Joe Biden and his son, Hunter, to testify in order to embarrass them and their party.

The Bidens are at the root of the abuse of power charges against Trump.

Trump had asked newly-elected Ukrainian President Volodymyr Zelentsky in a July phone call to investigate the Bidens' dealings in his country as a "favour".

Democrats say that this was inviting foreign intervention in US elections because Joe Biden is the leading Democratic party candidate for the nomination to oppose him.

Moreover, they say that he froze about $400 million in Congressionally-approved military aid for pressure Zelentsky to order the probe and this endangered US national security as Ukraine is at war with Russia.

chiff and the other prosecutors said delaying the aid was an attempt at a quid pro quo.

Zelentsky has said that he did not feel pressured by Trump.

Hunter Biden, who was removed from the Navy allegedly due to drug use and had no energy business experience landed a directorship in a Ukrainian gas company with monthly payments reportedly between $50,000 and $83,000 while his father was overseeing Washington's dealings with Kiev.

The former Vice President has publicly admitted that he got the Ukrainian leaders to fire the prosecutor investigating his son's company.

The Republicans have said that the son's appointment was unethical and the father had the prosecutor removed to protect his son's company.

In their arguments, the Democratic prosecutors said there was nothing wrong in Hunter Biden getting the job and his father had the prosecutor dismissed because he was corrupt.

The defence team is expected to assert that Trump withheld the aid because he wanted to be sure that the new government was not corrupt and the aid was released without a probe.

Anticipating the argument, Schiff said that Trump had allowed the aid to go forward only because it became known and his intent still made him guilty.

In another development impinging on the Trump case, a secret recording said to be of the president ordering the firing of Marie Yovanovitch as US ambassador to Ukraine in 2018 has surfaced.

She was one of the witnesses at the House investigations of the charges against Trump.